Tehran: Prime Minister Manmohan Singh would arrive Iran today on a four-day visit to attend the NAM Summit on Thursday, prior to which he will hold crucial bilateral talks with Iran's top leadership, including supreme leader Ayatollah Ali Khamenei, ignoring US reservations.

Singh will also be holding bilateral meetings with leaders from other countries, including Pakistan President Asif Ali Zardari and Bangladesh Prime Minister Sheikh Hasina on the sidelines of the 16th Summit of the 120-nation grouping.

Ahead of the meeting between India and Iran, New Delhi has made it very clear that discussion on peace and security will be of the paramount concern which will be raised with Tehran.

"Peace and security is, indeed, our primary concern given just how important the entire West Asia region, Gulf region, in particular, is for India's security and for Indian economy, both in terms of oil imports and our exports. So, this is our own concern and we don't have to take anybody else's concern as priority," Foreign Secretary Ranjan Mathai had said in New Delhi.

Singh's bilateral meet with Khamenei and President Mahmoud Ahmadinejad assumes significance as it will take place at a time when the US is pushing India to reduce engagement with Iran and implement sanctions imposed by some countries over its controversial nuclear programme.

While the West has been trying to underplay Iran hosting the NAM Summit, Tehran sees the event as a major diplomatic achievement.